martes, 1 de septiembre de 2009

Examen cisco CCNA1 CAPITULO 2

Which two layers of the OSI model have the same functions as the TCP/IP model Network Access Layer? (Choose two.)
* Physical
* Data Link

What is a primary function of the trailer information added by the data link layer encapsulation?
* supports error detection
ensures ordered arrival of data
provides delivery to correct destination
identifies the devices on the local network
assists intermediary devices with processing and path selection

During the encapsulation process, what occurs at the data link layer?
No address is added.
The logical address is added.
* The physical address is added.
The process port number is added.

What device is considered an intermediary device?
file server
IP phone
* switch

Which layer encapsulates the segment into packets?
* data link

Which statements correctly identify the role of intermediary devices in the network? (Choose three.)
* determine pathways for data
initiate data communications
* retime and retransmit data signals
originate the flow of data
* manage data flows
final termination point for data flow

What can be identified by examining the network layer header?
the destination device on the local media
* the path to use to reach the destination host
the bits that will be transferred over the media
the source application or process creating the data

What is the proper order of the layers of the OSI model from the highest layer to the lowest layer?
physical, network, application, data link, presentation, session, transport
application, physical, session, transport, network, data link, presentation
application, presentation, physical, session, data link, transport, network
* application, presentation, session, transport, network, data link, physical
presentation, data link, session, transport, network, physical, application

Refer to the exhibit. Which three labels correctly identify the network types for the network segments that are shown? (Choose three.)
Network A -- WAN
* Network B -- WAN
* Network C -- LAN
Network B -- MAN
Network C -- WAN
* Network A -- LAN

What are the key functions of encapsulation? (Choose three.)
allows modification of the original data before transmission
* identifies pieces of data as part of the same communication
enables consistent network paths for communication
* ensures that data pieces can be directed to the correct receiving end device
* enables the reassembly of complete messages
tracks delay between end devices

Refer to the exhibit. Which networking term describes the data interleaving process represented in the graphic?
* encapsulation

What is a PDU?
corruption of a frame during transmission
data reassembled at the destination
retransmitted packets due to lost communication
* a layer specific encapsulation

Refer to the exhibit. "Cell A" at IP address has established an IP session with "IP Phone 1" at IP address Based upon the graphic, which device type best describes the function of wireless device "Cell A?"
the destination device
* an end device
an intermediate device
a media device

Refer to the exhibit. Which set of devices contains only end devices?
A, C, D
B, E, G, H
C, D, G, H, I, J
D, E, F, H, I, J
* E, F, H, I, J

Refer to the exhibit. Which term correctly identifies the device type that is included in the green area?
* intermediary

Which three statements best describe a Local Area Network (LAN)? (Choose three.)
* A LAN is usually in a single geographical area.
* The network is administered by a single organization.
The connection between segments in the LAN is usually through a leased connection.
The security and access control of the network are controlled by a service provider.
* A LAN provides network services and access to applications for users within a common organization.
Each end of the network is generally connected to a Telecommunication Service Provider (TSP).

Refer to the exhibit. What type of network is shown?

What is the purpose of the TCP/IP Network Access layer?
path determination and packet switching
* data representation, encoding, and control
reliability, flow control, and error detection
detailing the components that make up the physical link and how to access it
the division of segments into packets

Which characteristic correctly refers to end devices in a network?
manage data flows
originate data flow
* retime and retransmit data signals
determine pathways for data

What is the primary purpose of Layer 4 port assignment?
to identify devices on the local media
to identify the hops between source and destination
to identify to the intermediary devices the best path through the network
to identify the source and destination end devices that are communicating
* to identify the processes or services that are communicating within the end devices

Select the statements that are correct concerning network protocols. (Choose three.)
* define the structure of layer specific PDU's
dictate how to accomplish layer functions
* outline the functions necessary for communications between layers
limit hardware compatibility
* require layer dependent encapsulations
eliminate standardization among vendors

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